diff -r 000000000000 -r 6474c204b198 browser/devtools/styleeditor/test/browser_styleeditor_filesave.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/devtools/styleeditor/test/browser_styleeditor_filesave.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,100 @@
+/* vim: set ts=2 et sw=2 tw=80: */
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+const TESTCASE_URI_HTML = TEST_BASE + "simple.html";
+const TESTCASE_URI_CSS = TEST_BASE + "simple.css";
+
+const Cc = Components.classes;
+const Ci = Components.interfaces;
+
+let tempScope = {};
+Components.utils.import("resource://gre/modules/FileUtils.jsm", tempScope);
+Components.utils.import("resource://gre/modules/NetUtil.jsm", tempScope);
+let FileUtils = tempScope.FileUtils;
+let NetUtil = tempScope.NetUtil;
+
+function test()
+{
+  waitForExplicitFinish();
+
+  copy(TESTCASE_URI_HTML, "simple.html", function(htmlFile) {
+    copy(TESTCASE_URI_CSS, "simple.css", function(cssFile) {
+      addTabAndOpenStyleEditors(1, function(panel) {
+        let UI = panel.UI;
+        let editor = UI.editors[0];
+        editor.getSourceEditor().then(runTests.bind(this, editor));
+      });
+
+      let uri = Services.io.newFileURI(htmlFile);
+      let filePath = uri.resolve("");
+      content.location = filePath;
+    });
+  });
+}
+
+function runTests(editor)
+{
+  editor.sourceEditor.once("dirty-change", () => {
+    is(editor.sourceEditor.isClean(), false, "Editor is dirty.");
+    ok(editor.summary.classList.contains("unsaved"),
+       "Star icon is present in the corresponding summary.");
+  });
+  let beginCursor = {line: 0, ch: 0};
+  editor.sourceEditor.replaceText("DIRTY TEXT", beginCursor, beginCursor);
+
+  editor.sourceEditor.once("dirty-change", () => {
+    is(editor.sourceEditor.isClean(), true, "Editor is clean.");
+    ok(!editor.summary.classList.contains("unsaved"),
+       "Star icon is not present in the corresponding summary.");
+    finish();
+  });
+  editor.saveToFile(null, function (file) {
+    ok(file, "file should get saved directly when using a file:// URI");
+  });
+}
+
+function copy(aSrcChromeURL, aDestFileName, aCallback)
+{
+  let destFile = FileUtils.getFile("ProfD", [aDestFileName]);
+  write(read(aSrcChromeURL), destFile, aCallback);
+}
+
+function read(aSrcChromeURL)
+{
+  let scriptableStream = Cc["@mozilla.org/scriptableinputstream;1"]
+    .getService(Ci.nsIScriptableInputStream);
+
+  let channel = Services.io.newChannel(aSrcChromeURL, null, null);
+  let input = channel.open();
+  scriptableStream.init(input);
+
+  let data = "";
+  while (input.available()) {
+    data = data.concat(scriptableStream.read(input.available()));
+  }
+  scriptableStream.close();
+  input.close();
+
+  return data;
+}
+
+function write(aData, aFile, aCallback)
+{
+  let converter = Cc["@mozilla.org/intl/scriptableunicodeconverter"]
+    .createInstance(Ci.nsIScriptableUnicodeConverter);
+
+  converter.charset = "UTF-8";
+
+  let istream = converter.convertToInputStream(aData);
+  let ostream = FileUtils.openSafeFileOutputStream(aFile);
+
+  NetUtil.asyncCopy(istream, ostream, function(status) {
+    if (!Components.isSuccessCode(status)) {
+      info("Coudln't write to " + aFile.path);
+      return;
+    }
+
+    aCallback(aFile);
+  });
+}